Perf: fixed speed regression by linkifier

lib/rules_text/linkify.js

@@ -8,6 +8,8 @@
 var Autolinker = require('autolinker');
 
 
+var LINK_SCAN_RE = /www|\:\/\//;
+
 var links = [];
 var autolinker = new Autolinker({
   stripPrefix: false,
@@ -41,10 +43,9 @@ module.exports = function linkify(t, state) {
     // Skip content of markdown links
     if (token.type === 'link_close') {
       i--;
-      while (tokens[i].type !== 'link_open' && tokens[i].level !== token.level) {
+      while (tokens[i].level !== token.level && tokens[i].type !== 'link_open') {
         i--;
       }
-      i--;
       continue;
     }
 
@@ -59,9 +60,8 @@ module.exports = function linkify(t, state) {
     }
     if (htmlLinkLevel > 0) { continue; }
 
-    if (token.type === 'text' &&
+    if (token.type === 'text' && LINK_SCAN_RE.test(token.content)) {
-        (token.content.indexOf('://') ||
+
-         token.content.indexOf('www'))) {
       text = token.content;
       links = [];
       autolinker.link(text);